Change-speed gearing



April 5, 1927.

v A. LAUB l CHANGE SPEED GEARING Tim- I .liDoLF LAUB, or BASEL', .swirznunaivn assitance To 'rire niniviraoennssion s. A1, or' LA'oHAUX-DEy-roivns,.SWITZERLAND f CHANGE-SPEED unanime.

Application filed September 8, 1,925, Serial No.

driving members eccentrically adjustable relative to the axis of rotation in radial guides provided in one of these elements.

l In'prior" constructions these drivingV ele-` mentsusually consist of spring controlled pawls, but as the latter may cause trouble when rapidly rotated they are replaced, ac,

cording to the present invention, `by members inserted between two rings which are slightly adjustable eccentrically -relative yto one another, so that v'during rotation these members become wedged one after another at the narrowest part of the space between the rings so that in this position the meme bers hold the rotating elements coupled to Vone lanother and subsequently run freely` again.

The drawing illustrates two 'constructional forms of the invention: i Figure l is an axial section and Figure 2 a cross section of a driving belt pulley pro-` vided with one constructional forni 'of the invention;

Figure 3 is a partial front viewof F ige,

ure l; i

Figure 4 is an vaxial section Vthrough a compound gear composed of two separate gears constructed according to the inven-` tion, and arranged to effect ratios ot' transmission; i Figure 5 is a cross-section on the line 5-5 of Figure 4; i i,

Figures f o and 7 illustrate` details of an v adjusting device for this compound/gearing. In the construction according to Figures l, 2 and 3,'the belt pulley @is the driving element and the shaft o the rotary 4driven element. The belt pulley a is mounted so as to rotate freely ron'l a central bodymc. The disc Z is secured to the shaft b and is provided with radial guide slots d1 forthe carriers f arranged in the form of a ring. By means of these slots the carrier' ring` can be adjusted concent'rically or eccentrical-ly tothe axis of the shaft. The carriers f are shown at f1 as sliding blocks,fwhich"are located between two 'rings a1 and a2 firmly connect-ed `to the belt pulley t as regards rotation, one of said rings, al, being rigidly connected to the pulley a, whilst the other a2 is freely rotatable on a ring plate h dis- `engaging with higher gear 55,131, and in Switzerland vSeptemberv 22V, 19M'.

pla'ceably arranged within .the central body fc, being however connected tothe pulleyother, so that .they form a restricted pas-Y sage for the sliding blocks f? at one point,

andk at the diametrically opposite point an enlarged passage for theselfiloclts.` l/Vher'iV the sliding vblocks f2' arrive :at this fre-1 stricted part they become wedged between l the rings al, a2 thus rigidly 'coupling the latter together, and the rotarymovementof the belt pulley is thereby transmitted to the disc CZ4 and thusV to the shaft'b. The rela'f` tive eccentric adjustment of the, rings al, a2 is eifected by means ofl an eccentric pin' g1 the radially fdisplaceable spring controlled ring plate ,-which sup-A ports thering a2. y l f In order lto alter thegear ratio lof trans?V mission the central body c, together' with the rotatable belt pulley` aV and therings al, a2, is displaced byvmeans ofa'slider mount-L ed on a 'rigid guide platek, sothat the ring trically or eccentricallyto the shaft axis. Vith concentric adjustment of the carrier ring ther transmission 'of motiongis effected without change of speed,l whereas, with eccentric adjustment the transmission of motion' i'smore highly geared up the ,f jreater` the eccentricityl of the carrier ring.l The central body` .c which is provid-ed with a longitudinal slit c? (Figure 2) can be dis-v placed by mean-s of a hand ope-rated plate supporting the carriers f is adjustedconcenm secured thereto, and preferably adapted to be secured in position yafter adjustment.

The but is appiied to the beit pulley a in i suchvr a lmanner that the motion of the former is ina `direction perpendicular to the c, so that the former motion offers no hindrance tothe latter movement'.

ldirec-tion of movement of the central bodyk ico It the carrier rin-g fisadjusted ecofm-tri-` cally or thedesired gear ratio, the,carriery sliding blocks'V f1 upon rotation oit the belt pulley a are rigidlywedged one afterf` another at the restricted part of the passage between the rotating,ringsv al, a2, so as t0 transmit the movement ofthe belt pulley a to the disc cl, and after passing the re'- stricted part these blocks run lfreely again* f one after another, the distribution of the i carriers over the circumferenceof the gear being'such that at anytime one at least of lthe carriers. is wedged, so that Ano interruption cantalre placel in the transmission of: the motions` In' this manner the motion y Y *length for this purpose, the spindle 23 beofthe belt pulley cris ltransmitted to the shaft I), in the adjusted speed ratio.'y For iree running lthe ring 'a2 is adjusted so as to beexactlyf concentrie to the ring @1 by meanswo'i: the veccentric .-pin g, so that,v the ycarrier sliding bloclfs` `f1 cany pass. through fthespacebetwecn -`the rings ireely. with 'j "slight play.

With double gearingaccording to Figures i157, 1 is a driving and 2 a driven shattcbe-y tween which is insertedja sha't't section 3,

which may be regarded relative'to the shatt 1 as adriven shaitj and relative to the shaft 2 as a vdriving vshaft. y The shaft section `3 j forms part/cfa Centralbody 5 movabletof and-frofin a lguide et; Vit is pivotally sup-A ported in this 'guide on ball bearings and "carries at each individual-gearing the rings 6 and 6 for we'dging thesliding blocks f1 of the carriers which are adjustable in the radial guide slots ofthe discs Sjor 9 secured "tothe shafts 1 orw2. y*Thev operation ot the carri-erin Vtransmitting thev movement 'from one element to the correspending other yelement is'in this case vthe same as before fory each individual gearing. T ie adjustment of the carrier f is veffected for `each 'of the gearsV at the Sametime and'in the same direction by means of the' central body 51Which for ythis purpose is pivotally connected with a {screw-threaded spindle 10 passing through a 'f vscrew-threaded boss 11* on the gear boX, and

' Y that `while in' one ot these gearsth-e restrictedv Vits"movement can be'feffected' by means of a hand wheel'l. On'cthe other hand the reciprocal eccentric adjustment of the rings 6', 6? in the ytwo individual gears is such f part betweentherings is locatedin a cert-ain position, in the other the restrictedpart is in a diametrically opposite posit-ion, vso that a doublegearing up ot the motion can take place. The latter object is attained by the adjusting device shown'in Figures 6 and 7.

'Theouter rings llofuthe two individual Vgears are pivotally mounted on cylindrical bosses formed onvcros's plates 16, lwhich are each mounted` on a 'fixed pivot -17 (Figure at one end, "andare each provided at the other end slot 18 in which projects a rotatable eccentric pivot 19,v the iixed plates 16 are rotated in opposite directions to oneanother', soj that in one gearing the restricted 'part of the rings, 6 for wedging the `carrieris `t'oprn'ied below,y and inv the othergearing abovea The rod 21 canl be adjusted by means of a screw-threaded spindle 23 which traverses theV screwthreaded spindle 10 the latter in this caseKV being made hollow throughout its whole elen'ients, two rings onthe other rotary sie? ment to receive vsaid coupling members beitwe-en them and .positioning means toso` position said rings as to be slightly 'eccentric to one another, for thev purpose specilied.

f2. 'A change speed gearing comprising a rotary driving element, a rotaryfdriven ele ment, a series of coupling memberseccen-H trically: adjustable relative to the axis of rotation of the gear on one of said rotary' elementstwo rings, on the other rotary ele ment toreceive said coupling members between "them, means to connect said rings with said rotary element in the direction of rotation whilst allowing a relative radialy displacement thereof, and adjusting means to so position said rings as tor'be slightly eccen-` tric to one another, for the purpose specified, 3. A change speed gearing comprising a rotarydrivingelement, a rotary driven element, a .series-.ot coupling members eccentrically adjustablerelative to the axis of rotationv of the gear on one of said rotary elements, two rings on' the other rotary ele- Vment to receive said Acoupling members ybetween them, and a'displaceable central body forV rotatably supporting said rings, arA ranged to cause by its displacement the eccentric adjustment of the coupling members.

4. A `change speedgearing comprising a rotaryf driving element, a rotary driven element, a series of 'coupling members eccentrically adjustable relative to vthe axisy of rotationo'f the gear on one'of said rotary rod 21 thus per j elements; two rings on the other rotary ele- Y ment to receivelsaid couplingmembers be tweenthem, and positioning means to so l position said rings as to be slightly eccentric to oneanother, said positioning means being arranged to allow of a concentric adjustment of said rings to one another i-or a free running of the coupling members inV the spacefbetween the rings.

In witness'whereor" I have hereunto signed my naine th1's2th day lof August, 1925.

A DoLr Laue. 

